Program: HathiTrust Digital Library

  • Publisher: Research Division, American Optical Co.
  • Print ISSN:
  • Electronic ISSN:
  • OCLC Number: 1480179
  • Validation: None
  • Retention: permanent
  • Institution: HathiTrust
  • Facility:
  • OCLC Symbol: HATHI
  • Holdings Format: Print
Materials Archive Action Date of Action Program Status/Note
v.1; v.1:4(1920); v.1 (1920); v.1-2 (1920-21); v.1 no.2-v.2 1920/21; v.2 (1921); v.3:2(1922); v.3 (1922); v.4 1923; v.5 1924; v.6-7 (1925-26); v.1(1920); v.3(1922)
committed to retain 2022-01-01 HTDL