Herbert Schumann
Reports
1988
Schumann, H. H. and S. R. Anderson. 1988. Land-subsidence measurements and aquifer-compaction monitoring in Tucson Basin and Avra Valley, Arizona. US Geological Survey. Water Resources Investigations 88-4167. (link )
1968
Thomsen, B. W. and H. H. Schumann. 1968. Water resources of the Sycamore Creek watershed, Maricopa County, Arizona. U.S Government Printing Office. Water Supply Paper 1861. (link )