| 其他書名 | Techniques for Compiling Data Indicating Traffic Hazards and Protection to Children Walking to and from School and Mapping the Safest Routes to Travel, with Guiding Principles for Selecting the Safest Routes |
| 出版 | Works Progress Administration, Division of Social Research, 1939 |
| URL | http://books.google.com.hk/books?id=hEIXAAAAIAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |