TY - MAP ID - 134565897 TI - Maps showing areal distribution of selected chemical constituents and hardness in shallow ground water, Tucson basin, southeastern Arizona PY - 1972 PB - Washington (D.C.) U.S. Geological Survey DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:134565897 AB - ER -