TY - RPRT TI - Placental localization using 51Cr tagged erythrocytes. AU - J Crossley AU - M G Elder AU - K M Muir PY - 1968 DO - 10.1111/j.1471-0528.1968.tb00147.x UR - https://pubmed.ncbi.nlm.nih.gov/5647708/ ID - 5647708 ER -