Symbol signs 2 /
| Corporate Authors: | , |
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| Format: | Government Document Book |
| Language: | English |
| Series: | DOT-OS-60510
Report - Research and Special Programs Administration ; no. DOT-RSPA-DPB-40-79-2 |
| Subjects: |
| Item Description: | March 1979. |
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| Physical Description: | 148 pages : illustrations ; 28 cm. |
| Bibliography: | Bibliography: pages 147-148. |