| psc | description |
| •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• | |
| B502 | Study/air quality |
| B503 | Study/archeological-paleontological |
| B504 | Study/chemical-biological |
| B505 | Study/cost benefit |
| B506 | Study/data - other than scientific |
| B507 | Study/economic |
| B509 | Study/endangered species-plant/animal |
| B510 | Study/environmental assessments |
| B513 | Study/feasibility - non-construction |
| B516 | Study/fisheries and animal |
| B517 | Study/geological |
| B518 | Study/geophysical |
| B519 | Study/geotechnical |
| B520 | Study/grazing-range use |
| B521 | Study/historical |
| B522 | Study/legal |
| B524 | Study/mathematical-statistical |
| B525 | Study/natural resource |
| B526 | Study/oceanological |
| B527 | Study/recreation |
| B528 | Study/regulatory |
| B529 | Study/scientific data |
| B530 | Study/seismological |
| B532 | Study/soil |
| B533 | Study/water quality |
| B534 | Study/wildlife |
| B537 | Study/medical and health |
| B538 | Study/intelligence |
| B539 | Study/aeronautic/space |
| B540 | Study/building technology |
| B541 | Study/defense |
| B542 | Study/educational |
| B543 | Study/energy |
| B544 | Study/technology |
| B545 | Study/housing and community development |
| B546 | Study/security (physical & personal) |
| B547 | Study/accounting/financial management |
| B548 | Study/trade issues |
| B549 | Study/foreign & national security policies |
| B550 | Study/organization/administrative/personnel |
| B551 | Study/mobilization/preparedness |
| B552 | Study/manpower |
| B553 | Study/communications |
| B554 | Study/acquisition policy/procedures |
| B555 | Study/elderly-handicapped |
| B599 | Other special studies & analyses |
