Subject
- Rankin, John C., Jr.1
- Rayon industry and trade1
- Read Holliday & Sons1
- Red lead1
- Reference books1
- Reflectance spectroscopy1
- Reflection (Optics)1
- Refractories industry1
- Religion and science1
- Resist-dyed textiles1
- Restell, Madame, 1811-18781
- Reynolds Metals Company1
- Rich, Elihu, 1819-18751
- Richards, Ellen H. (Ellen Henrietta), 1842-19111
- Rivers1
- Roscoe, Henry E. (Henry Enfield), 1833-19151
- Röntgen, Wilhelm Conrad, 1845-19231
- Rubber goods1
- Rugs, Hooked1
- Rumford Company1