List of Classes of United States Government Publications Available for Selection by Depository Libraries PDF Download
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Author:
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Category : Government publications
Languages : en
Pages :
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages :
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Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309461545
Category : Science
Languages : en
Pages : 33
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Book Description
The 2010 astronomy and astrophysics decadal survey, New Worlds, New Horizons in Astronomy and Astrophysics, laid out an exciting portfolio of recommended activities to guide the agencies' research programs over the period 2012-2021. The newly constituted Committee on Astronomy and Astrophysics (CAA) is tasked with monitoring the progress of the survey's recommended priorities. The CAA met in conjunction with Space Science Week 2017 in Washington, D.C., on March 28- 30, 2017. This was the first meeting at which the CAA could produce a report, and in advance of that meeting, the CAA received a question from NASA about an upcoming Small Explorer (SMEX) mission call. This report addresses whether there may or may not be sufficient compelling science motivations for a SMEX-sized mission to justify a SMEX Announcement of Opportunity (AO) in 2018 or 2019 (as is currently planned).
Author: Paul Johnsgard
Publisher: Lulu.com
ISBN: 1609621107
Category : Nature
Languages : en
Pages : 186
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Although the 12 species representing three waterfowl tribes described in this volume are not closely related, they fortuitously provide an instructive example of adaptive evolutionary radiation within the much larger waterfowl lineage (the family Anatidae), especially as to their divergent morphologies, life histories, and social behaviors. The whistling-ducks (Dendrocygna), with three known North American species, are notable for their permanent pair-bonds, extended biparental family care, and strong social cohesion. In contrast, males of the five typical pochards of North American diving ducks (Aythya) establish monogamous pair-bonds that are maintained only long enough to assure that the female's eggs are fertilized. The endpoint of this behavioral gradient, promiscuity or polygyny, exists among at least some of the typical stifftails (Oxyura). Such diverse reproductive strategies have exerted powerful evolutionary influences on interspecies variations in sexual dimorphism, sexual behavior, anatomy, ecology, and other traits. This volume includes more than 63,000 words, plus some 200 maps, photos, drawings, and sketches, and nearly 650 literature citations. It is the last of five volumes that describe all 55 waterfowl species that have been historically documented in North America; collectively, the volumes total over 300,000 words, with nearly 3,000 literature citations, and more than 600 maps, photos, drawings, and sketches.
Author:
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Category : Fishies
Languages : en
Pages : 1160
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Author: U.S. Fish and Wildlife Service
Publisher:
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Category : Game protection
Languages : en
Pages : 554
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Author:
Publisher: FEMA
ISBN:
Category :
Languages : en
Pages : 197
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Author:
Publisher:
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Category :
Languages : en
Pages : 626
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Author: Paul Johnsgard
Publisher: Lulu.com
ISBN: 1609621093
Category : Nature
Languages : en
Pages : 229
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This volume, the fourth in a series of books that collectively update and expand P.A. Johnsgard's 1975 The Waterfowl of North America, summarizes research findings on this economically and ecologically important group of waterfowl. The volume includes the mostly tropical perching duck tribe Cairinini, of which two species, the muscovy duck and the wood duck, are representatives. Both species are adapted for foraging on the water surface, mostly on plant materials, but typically perch in trees and nest in elevated tree cavities or other elevated recesses. This volume also includes the dabbling, or surface-feeding, duck tribe Anatini, a large assemblage of duck species that mainly forage on the water surface but nest on the ground, or only very rarely in elevated locations. Of this tribe, 12 species that regularly breed in North America are included, among them such familiar species as mallards, wigeons, pintails, and teal. Descriptive accounts of the distributions, populations, ecologies, social-sexual behaviors, and breeding biology of all these species are provided, together with distribution maps. Five additional Eurasian and West Indian species have been reported several times in North America; these have been included with more abbreviated accounts, but all 17 species are illustrated by drawings, photographs, or both. The text includes about 84,000 words and contains more than 1,000 references. There are also 12 distribution maps, 21 drawings, 28 photographic plates, and 58 anatomical or behavioral sketches.
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Category : Geology
Languages : en
Pages : 446
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Author: Umberto Albarella
Publisher: Oxbow Books
ISBN: 1789255376
Category : Social Science
Languages : en
Pages : 224
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This new collection of papers from leading experts provides an overview of cutting-edge research in Old World zooarchaeology. The research presented here spans various areas across Europe, Western Asia and North Africa – from the Mediterranean to the Atlantic. Several chapters focus on Iberia, but the eastern Mediterranean and Britain are also featured. Thematically, the book covers many of the research areas where zooarchaeology can provide a significant contribution. These include animal domestication, bone modifications, fishing, fowling, economic and social status, as well as adaptation and improvement. The investigation of these topics is carried out using a diversity of approaches, thus making the book also a useful compendium of traditional as well as more recently developed methodological applications. All contributions aim to present zooarchaeology as a discipline that studies animals to understand people, and their richly diversified past histories. This will be a valuable source of information not just for specialists, but also for general archaeologists and, potentially, also historians, palaeontologists and geographers, who have an interest for the research themes discussed in the book. The book is dedicated to Simon Davis, who has been a genuine pioneer in the development of modern zooarchaeology. It presents hugely stimulating case studies from the core areas where Davis has worked in the course of his career.
