List of Classes of United States Government Publications Available for Selection by Depository Libraries PDF Download
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Category : Government publications
Languages : en
Pages :
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Author:
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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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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).
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Category : Medicine
Languages : en
Pages : 298
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Author: Texas. Game, Fish, and Oyster Commission
Publisher:
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Category : Game and game-birds
Languages : en
Pages :
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Category :
Languages : en
Pages : 140
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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.
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Category : Fishies
Languages : en
Pages : 1160
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Author: U.S. Fish and Wildlife Service
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Category : Game protection
Languages : en
Pages : 554
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Publisher: FEMA
ISBN:
Category :
Languages : en
Pages : 197
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Author:
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Category :
Languages : en
Pages : 626
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