TY  - RPRT
TI  - First early Mesozoic amber in the Western Hemisphere
AU  - R. J. Litwin
AU  - S.R. Ash
PY  - 1991
DO  - 10.1130/0091-7613(1991)019<0273:femait>2.3.co;2
UR  - https://pubs.usgs.gov/publication/70016766
ID  - 70016766
ER  -