The pages below are from MIL handbook 1003/19, Miliatary Handbook -- Design Procedures for Passive Solar Building, 1987.
A very complete list of R values for building materials, insulation materials, and air films and air spaces.
The R values listed below are just a small excerpt -- the full MIL-HDBK-1003/19 solar passive design document can be downloaded here...
The Rvalues are in US units --- hr-F-ft^2/BTU.
The table is very complete and also includes a lot of information on air film resistance in various orientations, heat transfer directions and with/without reflective layers.