TY  - BOOK
AU  - Poul Anderson
TI  - The Shield of Time
SN  - 9780812510003
AV  - PS3551.N378 
U1  - 813.54 
PB  - Tor Books
KW  - Science Fiction
N2  - Manse Everard is a man with a mission. As an Unattached Agent of the Time Patrol, he's to go anyplace - and anytime! - where humanity's transcendent future is threatened by the alteration of the past. This is Manse's profession, and his burden: for how much suffering, throughout human history, can he bear to preserve?
ER  -