TY - BOOK ID - 136998849 TI - A history of saguaro cactus monitoring in Saguaro National Park, 1939-2007 AU - Ahnmark, Eric B. AU - Swann, Don E. AU - Wondrak Biel, Alice. AU - Natural Resource Program Center (U.S.) PY - 2009 PB - Fort Collins, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, DB - UniCat KW - Saguaro KW - National parks and reserves KW - Saguaro National Park (Ariz.) KW - Environmental conditions. UR - https://www.unicat.be/uniCat?func=search&query=sysid:136998849 AB - ER -