TY  - RPRT
TI  - X-rays in philately.
AU  - H C POLLACK
AU  - C F BRIDGMAN
PY  - 1954
DO  - 10.1148/62.2.259
UR  - https://pubmed.ncbi.nlm.nih.gov/13134514/
ID  - 13134514
ER  -