TY  - RPRT
TI  - Histologic structures preserved for 21,300 years.
AU  - M R Zimmerman
AU  - R H Tedford
PY  - 1976
DO  - 10.1126/science.785601
UR  - https://pubmed.ncbi.nlm.nih.gov/785601/
ID  - 785601
ER  -