TY - RPRT TI - Reversible and irreversible hydrocolloid impression materials. AU - E W SKINNER AU - E N COOPER AU - F E BECK PY - 1950 DO - 10.14219/jada.archive.1950.0029 UR - https://pubmed.ncbi.nlm.nih.gov/15409370/ ID - 15409370 ER -