Subject
- Ramsay, William G. (William Gouverneur), 1866-19161
- Rankin, John C., Jr.1
- Rare Books1
- Rare books1
- Rayon industry and trade1
- Read Holliday & Sons1
- Recombinant erythropoietin1
- Red lead1
- Reducing diets1
- Reference books1
- Reflectance spectroscopy1
- Reflection (Optics)1
- Refractories industry1
- Religion and science1
- Renewable energy sources1
- Research1
- Resist-dyed textiles1
- Reynolds Metals Company1
- Rhinoceroses1
- Rich, Elihu, 1819-18751