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244 HOW TO ORDER Items for Sale 1. NCHRP Series Reports, Syntheses, and Research Results Digests (see Tables 6, 7, and 8 for prices). 2. Research agencies' final reports (see project summaries for prices). 3. Microfiche ($5.95 per report). Price may change without notice. See latest Summary of Progress for current cost. 4. Other TRB publications. A check or money order, payable to Transportation Research Board, must accompany orders totaling $20.00 or less. Mail to: Publications Office Transportation Research Board 2101 Constitution Avenue, NW. Washington, DC 20418 Items for Loan 1. Some research agencies' final reports, manuals, videotapes, etc., are identified in the project summaries and are available on a loan basis upon written request to the NCHRP, 2101 Con- stitution Avenue, N. W., Washington, DC 20418. 2. Loan requests for films and tapes should be directed to: TRB Audio-Visual Library Transportation Research Board 2101 Constitution Avenue, N. W. Washington, DC 20418 Mailing and handling charges may be assessed, especially where 1st-class delivery is requested; an invoice will accompany the loaned item. \