- Wildflowers of the United States: Index by Harold W. Rickett, 1975-08
- The National Parks: Index, 2005-2007: Revised to Include the Actions of the 108th Congress Ending December 31. 2004 (National Parks: Index)
- Fishes: Tilapia : Index of New Information and Research Bible (Tilapia : Index of New Information & Research Bible) by Alfred M. Ackermann, 1994-08
- Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography [An article from: Forest Ecology and Management] by C. Macfarlane, S.K. Arndt, et all 2007-04-30
- The h index and career assessment by numbers [An article from: Trends in Ecology & Evolution] by C.D. Kelly, M.D. Jennions, 2006-04-01
- Environmental Success Index, 1992 by Prima Publishing, Renew America, 1993-05
- The relative density of forests in the United States [An article from: Forest Ecology and Management] by C.W. Woodall, C.H. Perry, et all 2006-05-01
- Index of Leading Environmental Indicators 2006 by Steven F. Hayward, 2006-04-30
- Habitat suitability index models: Black-tailed prairie dog (Biological report) by Norman W Clippinger, 1989
- Index to Plant Chromosome Numbers 1975-78 by Peter Goldblatt, 1981-12-01
- Index of Leading Environmental Indicators 2005 by Stephen F. Hayward, 2005-07-30
- Australian Plant Name Index: K - P (Australian Flora and Fauna Series, Vol 14)
- Endangered Species: A Bibliography With Indexes
- Plants Collected by the Vernay Nyasaland Expedition of 1946 (continued) with Index to Volume 8 (Memoirs of The New York Botanical Garden Vol. 8(5)) by J. P. M. Brenan, 1954-02-27
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