00402nam a2200133Ia 4500 190415s9999 xx 000 0 und d 9780309592871 PK-NaQUE National Research Council Space Studies Board National Academies Pres 1995 https://ebookcentral.proquest.com/lib/hec-ebooks/detail.action?docID=3377967&query= 65581 65578 0 0 0 0 QUESTCL HECDL 2019-10-09 0 A53 2019-10-09 00:00:00 2019-10-09 BK