TY  - BOOK
AU  - Woodburne, Michael O.
TI  - Cenozoic mammals of North America : geochronology and biostratigraphy
PB  - University of California Press
PY  - 1987
EP  - xv, 336 p.
UR  - http://ci.nii.ac.jp/ncid/BA04477585
SN  - 0520053923
ER  -