Report discussing the ecology restoration activities in the U.S.-Mexico border region. Part of a series of annual reports prepared by the Good Neighbor Environmental Board for the President and Congress of the United States.

Report discussing climate change and resilient communities in the U.S.-Mexico border region. Part of a series of annual reports prepared by the Good Neighbor Environmental Board for the President and Congress of the United States.

The genetic structure of 26 natural populations of three species (S. tridecemlineatus, S. mexicanus, and S. spilosoma) of the Ictidomys subgenus of ground squirrels was analyzed using chromosomal and electrophoretic techniques. Chromosomal variation was not observed in S. mexicanus, and only slight karyotypic variation was found in the other two species. Chromosomal evidence indicated hybridization between S. tridecemlineatus and S. mexicanus, placing these species within the classical definition of semispecies. Analysis of electrophoretic variation at 29 genetic loci indicated close genetic relationships between these species. Evolution in Ictidomys appears to be linked with Pleistocene events, and speciation appears to have occurred within the last 155,000 years.

Copy of a letter from Galveston, discussing Thomas Falconer's affairs and reassuring the recipient that Falconer's silence in response to six letters is because he has been captured with the Santa Fe Expedition. It also discusses the terms of a sum of money Falconer drew and a term set by Messrs. Meyer & Co. (written as "& Sons" earlier in document) and gives a brief summary of how he joined the expedition. There are notes on cities and dates on the back page.

Copy of transcript for letters from Stephen F. Austin, sent during the period of June 5, 1830 until December 14, 1830.