- Ramey, Bern C. Papers. (D-389)
- Rappoport, Solomon [Ansky] (1863-1920). Collection. (MC093)
- Raveling, Dennis G. Papers (D-553)
- Ray, Martin and Eleanor. Papers. (D-335)
- Raynesford, Howard C. Papers. (MC084)
- Reclamation District #551. Archives. (D-196)
- Reed Quicksilver Mine Collection (MC251)
- Reid, David W. Papers. (D-090)
- Religion and Agriculture Collection. (MC058)
- Rettinger, Michael (1905- ). Collection. (MC049)
- Revere Copper and Brass, Inc. Collection. (MC065)
- Reynolds, Christopher A. Collection of Women’s Song. (D-435)
- Reynoso, Cruz. (1931- ). Papers. (D-401)
- Richardson, Bertram. Papers. (MC039)
- Richardson, Charles S. Papers. (MC176)
- Richardson, Fred. Collection. (MC060)
- Richter, Max Clemens (1884-1973). Papers. (D-083)
- Riddell, Adaljiza Sosa. Papers. (D-397)
- Riley, Norman E. Photographs (D-550)
- Risling, David. Papers. (D-334)
- Rixford, Emmet H. Scrapbook (MC245)
- Robertson, David. Papers (D-124)
- Robinson, Jancis. Papers on Wine Writing (D-612)
- Rockwell, Don A. Papers (D-569)
- Roddy, Kevin. Papers (D-526)
- Rodgerson, Eleanor, MD. Papers. (D-439)
- Roessler, Edward Biffer (1902-1993). Papers. (MC105)
- Rogers, John H. Collection (MC193)
- Rominger, Richard. Papers. (D-087)
- Rondeau, René. Wine Label and Menu Collection (D-620)
- Rosen, Jerome. Papers (D-568)
- Rost, Thomas. Papers. (D-375)
- Roth, Raymond F. Papers. (D-234)
- Rothchild, Donald S. Writings. (D-537)
- Rothstein, Morton. Papers. (D-355)
- Rowe, Albert H. (1889-1970). Papers. (D-014)
- Royal Arch Masons. Manzanita Chapter No. 29. Ledger. (D-411)
- Rudin, Edward (1922-2003). Papers. (D-420)
- Rudisill, Janet. Collection. (MC168)
- Russell, William O. (1910-1997). Papers. (D-275)
- Ruth Pierce Mine Collection (MC252)
- Ryerson, Knowles A. (1892-1990). Papers. (D-011)
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