TY  - RPRT
TI  - The rapids and the pools - Grand Canyon: Chapter D in The Colorado River region and John Wesley Powell (Professional Paper 669)
AU  - Luna Bergere Leopold
PY  - 1969
DO  - 10.3133/pp669d
UR  - https://pubs.usgs.gov/publication/pp669D
ID  - pp669D
ER  -