Author not established. Flourishing of professional associations 1950s and early 1960s. Date not established. EHREA archive: /library/documents/doc-7ec9c9726ca3923b903278f7/
[1] Flourishing of professional associations 1950s and early 1960s. Original source: http://www.ehrea.org/prof1950.php. Preserved original: /library/originals/7bdb818fc51e52eb60925f0f76418683e0bffa87221fbd32136b87524a2879e9.html. SHA-256: 7bdb818fc51e52eb60925f0f76418683e0bffa87221fbd32136b87524a2879e9