TY  - RPRT
TI  - A guided inquiry approach to learning the geology of the U.S
AU  - M.L. Leech
AU  - D. G. Howell
AU  - A.E. Egger
PY  - 2018
DO  - 10.5408/1089-9995-52.4.368
UR  - https://pubs.usgs.gov/publication/70026587
ID  - 70026587
ER  -