Matching Items (17)
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Created1929-02-28
DescriptionMonthly bulletin, black and white, describing the natural history and scientific features of Grand Canyon National Park. This volume is dedicated in memoriam to Glen E. Sturdevant, park naturalist, and Fred Johnson, park ranger, who drowned while collecting specimens in the park.
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Created1930
Description

Typescript report, black and white, describing the birds of Grand Canyon National Park with cover drawing of a bald eagle.

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Created2004
Description

Apache trout is a federally threatened salmonid native to headwaters of the Little Colorado, Black, and White rivers in east-central Arizona. Decline of Apache trout to threatened status was attributed to over-fishing, habitat degradation and negative interactions (predation, competition and hybridization) with introduced nonnative salmonids. Although over-fishing is no longer

Apache trout is a federally threatened salmonid native to headwaters of the Little Colorado, Black, and White rivers in east-central Arizona. Decline of Apache trout to threatened status was attributed to over-fishing, habitat degradation and negative interactions (predation, competition and hybridization) with introduced nonnative salmonids. Although over-fishing is no longer considered a threat, habitat degradation and negative interactions with nonnative salmonids continue to threaten Apache trout, and it is towards these threats that recovery actions are directed. While barrier construction began in 1979 and livestock exclusion began in the mid-1980s, the efficacy of these recovery actions at increasing Apache trout abundance and improving habitat condition had not been evaluated. We therefore initiated a study to evaluate the efficacy of riparian fencing and barriers.

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Created1926-04-02
DescriptionGrand Canyon National Park General Regulations.
ContributorsGosse, Edmund, 1849-1928 (Author) / Connelly, Mollie (Transcriber)
Created1849 to 1873
DescriptionConcerning the manuscript of Gosse's poem "Sunshine in March."
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ContributorsTong Yuan (Artist) / 童原 (Artist)
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ContributorsMinami, Keiko (Artist)
Created1925 to 2001
DescriptionEtching
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ContributorsMinami, Keiko (Artist)
Created1925 to 1995
DescriptionEtching (artist's proof)
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ContributorsPalgen-Maissoneuve, Mimi, 1918-1995 (Photographer)
Created1942 to 1962
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ContributorsPalgen-Maissoneuve, Mimi, 1918-1995 (Photographer)
Created1942 to 1962