"This report presents and summarizes terrestrial baseline data for the Third Quarterly Report on Tract C-a. Its purpose is to transmit information gathered during the period March through May, 1975. Although major revisions of the terrestrial program were approved in mid-May, 1975, a detailed description for new field methodology is included only for those elements of the revised terrestrial program (such as small mammal censusing) which were completed prior to May 31, 1975. Revised field programs which were completed after May 31, along with their associated raw data and preliminary interpretations will be documented in the September Quarterly Report. In this report, data gathered during the March through May, 1975, sampling period are presented and summarized, and some preliminary interpretations are made. The raw data are organized in appendices which appear as separate sub-sections under each of the major categories of investigation. . . . Because few definitive ecological trends are identifiable from the data obtained in just one quarter, complete statistical analyses and interpretations of results cannot be included. Significant facts, trends, or comparisons evident from the summarized data will be presented, but possible interpretations of their ecological significance are regarded as only tentative, subject to revision in future quarterly reports on the basis of new information contained therein"--Leaf viii.