Filtering by: Contributor Dr. & Mrs. Emil C. Beyer Remove constraint Contributor: Dr. & Mrs. Emil C. Beyer Location Duke Medical Center Library & Archives Remove constraint Location: Duke Medical Center Library & Archives Collection Library Artifact Collection Remove constraint Collection: Library Artifact Collection Subject Compound monocular Remove constraint Subject: Compound monocular Subject Microscope Remove constraint Subject: Microscope Subject Microscopes Remove constraint Subject: Microscopes