Aerial Surveys of Cliff-nesting Raptors in the National Petroleum Reserve-Alaska

Ritchie, R. J., A. M. Wildman, and D. A. Yokel. 2003. Aerial Surveys of Cliff-nesting Raptors in the National Petroleum Reserve-Alaska, 1999, with comparisons to 1977. Technical Note 413. Bureau of Land Management, Denver, CO. BLM/AK.ST-03/016+6501+023. 66 pp.

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