TY  - RPRT
TI  - Letter: Closed shop.
AU  - J R Lang
AU  - G W Burgess
PY  - 1975
DO  - 10.1136/bmj.1.5948.42-a
UR  - https://pubmed.ncbi.nlm.nih.gov/1120246/
ID  - 1120246
ER  -