[pt. 2.] Interim report no. 2. [Armstrong-Butler-Clarion counties] / William H. Gotolski ... [et al.] -- [pt. 2A.] Special report no. 2. Rates of asphalt hardening at in-service temperatures / W.H. Gotolski, S.K. Ciesielski, R.W. Smith -- [pt. 3.] Interim report no. 3. Chemical analysis test, procedure, precision, and results / William H. Gotolski ... [et al.] -- [pt. 3A.] Special report no. 3. Void parameters affecting asphalt concrete durability / R.W. Smith, W.H. Gotolski -- [pt. 6.] Interim report no. 6. LR 538 Beaver County, LR 141 Lebanon County, LR 41037 Lycoming County, LR 1113 Washington County / William H. Gotolski ... [et al.] -- [pt.8.] Research report IR-8 [no special title] September 1967 -- [pt. 9.] Research report IR-9. [no special title] / W.H. Gotolski, R.W. Smith, J.M. Roberts.
In cooperation with Pennsylvania Department of Highways, and the U. S. Department of Transportation, Bureau of Public Roads. UP-ANNEX copy of pt. 8 is reproduction distributed by Clearinghouse for Federal Scientific and Technical Information.