Lehrer, Stefan. Humanitarian logistics.which challenges do aid -agencies have to face in disaster relief ... operations and how can these operations be efficie - 1st ed. - German : GRIN Verlag , 2015. - 23 p. : ill. ; 24 cm. ISBN: 9783668418479 LCCN: 2011003435 LC Class. No.: HV553 / .L447 2015 Dewey Class. No.: 363.34068/7