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Letter from Carl T. Hayden to Michael J. Riordan explaining the benefits of selling Bright Angel Trail and building an approach road.
Letter from Michael J. Reardon to Carl T. Hayden, in agreement with Ralph Cameron, asserting that Bright Angel Trail should not be sold from Coconino County to the United States.
Report on the study of pollen samples from the Carlston-Annis shell midden site and test pit J-IV from Salts Cave Vestibule, Salts Cave, KY. Also see unpublished material "Additional Studies in Mammoth Cave National Park", 2006.
Date: 1973
Studied modern pollen rain/vegetation pattern relationships through discriminant functions analysis in Mammoth Cave National Park, KY, and archaeological-context pollen records from local Middle Woodland and Late Woodland sites. Concludes that analysis of this sort identifies control data for interpreting archaeological pollen records in terms of paleovegetation and paleoecological patterns.
Modern, Early Woodland, Middle Woodland
The Arizona Department of Transportation, the Arizona Game & Fish Department and the Arizona State Parks Board are required to conduct a study every three years on watercraft fuel consumption and recreational watercraft usage. The fuel consumption data is collected to determine the allocation of motor vehicle fuel tax to the State Lake Improvement Fund. The information on recreational watercraft usage patterns on Arizona’s lakes and rivers is necessary, in part, to determine the distribution of SLIF funds to applicants.