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Prepared under contract 14-10-9-990-186, Article II as revised 5 April 1970 with the U.S. Dept. of the Interior, National park Service.
Literature survey providing a guide to selected aspects of the environment - covers environmental protection, ecology, quality of life, urban development, environmental modifications relating to water quality, nature conservation, transport, etc., and includes a chronology of relevant laws, a directory of organizations and bibliographys.
List of members in each volume.
A journal of plant systematics, phytogeography and vegetation ecology.