1. by Brian Czech, and Paul R. Krausman
Distribution and Causation of Species Endangerment in the United States
by Brian Czech, and Paul R. Krausman
Science
Volume 277(5329):
August 22, 1997
Published by AAAS

2. Figure 1 Funds allocated for the U. S
Figure 1 Funds allocated for the U.S. Endangered Species Act (ESA) and number of species listed as endangered.
Funds allocated for the U.S. Endangered Species Act (ESA) and number of species listed as endangered. Funds in millions of constant 1976 dollars per fiscal year. Number of species listed as endangered per calendar year are current through 31 October Source: U.S. Fish and Wildlife Service.
Brian Czech, and Paul R. Krausman Science 1997;277:
Published by AAAS