No abstract

No abstract

No abstract

No abstract

No abstract

No abstract

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. American Geographical Society is collaborating with JSTOR to digitize, preserve and extend access to Geographical Review.ABSTRACT. This study compares the spatial structure of commercial activities in the central business districts of Laredo, Texas, and Nuevo Laredo, Tamaulipas. Greatest variations were for the categories of medical offices and restaurants and bars, which were relatively more significant in Nuevo Laredo, and electronicappliance outlets and clothing stores, which had a higher percentage of commercial establishments in Laredo. Differences are attributed to both cultural and economic factors, including the expanding transborder consumer market. Despite complex functional linkages, the two commercial cores remain distinctive places in urban form and landscape character. * DR. CURTIS is an associate professor of geography at Oklahoma State University, Stillwater, Oklahoma 74078.

Ample evidence has recently been reported which demonstrates that two discrete, strongly assisted pathways, ks (solvent assisted) and kA (aryl assisted), compete without crossover in the solvolyses of primary2 and secondary3 ß-arylalkyl arenesulfonates. We wish to report the results of buffered acetolysis of 2-(l-azulyl)ethyl tosylate (la) and certain derivatives which establish it as an exclusive kA process without the complicating factor of ion-pair return. Preliminary results, to be reported later, indicate that this system