| PSC | Description
|
| B502 | Air Quality Analyses |
| B503 | Archeological-Paleontological Studies |
| B504 | Chemical-Biological Studies |
| B505 | Cost Benefit Analyses |
| B506 | Data Analyses - Other than Scientific |
| B507 | Economic Studies |
| B509 | Endangered Species Studies - Plant/Animal |
| B510 | Environmental Assessments |
| B513 | Feasibility Studies (Non-Contruction) |
| B516 | Fisheries and Animal Studies |
| B517 | Geological Studies |
| B518 | Geophysical Studies |
| B519 | Geotechnical Studies |
| B520 | Grazing/Range Use Studies |
| B521 | Historical Studies |
| B522 | Legal Studies |
| B524 | Mathematical-Statistical Analyses |
| B525 | Natural Resource Studies |
| B526 | Oceanological Studies |
| B527 | Recreation Studies |
| B528 | Regulatory Studies |
| B529 | Scientific Data Studies |
| B530 | Seismological Studies |
| B532 | Soil Studies |
| B533 | Water Quality Studies |
| B534 | Wildlife Studies |
| B537 | Medical and Health Studies |
| B538 | Intelligence Studies |
| B539 | Aeronautic/space Studies |
| B540 | Building technology Studies |
| B541 | Defense Studies |
| B542 | Educational Studies |
| B543 | Energy Studies |
| B544 | Technology Studies and Analyses |
| B545 | Housing and Community Development Studies |
| B546 | Security (Physical & Personal) Studies |
| B547 | Accounting/Financial Management Studies |
| B548 | Trade Issue Studies |
| B549 | Foreign Policy & National Security Policy Studies |
| B550 | Organization/Administrative/Personnel Studies |
| B551 | Mobilization/Preparedness Studies |
| B552 | Manpower Studies |
| B553 | Communications Studies |
| B554 | Acquisition Policy/Procedures Studies |
| B555 | Elderly/Handicapped Studies |
| B599 | Other Special Studies & Analyses |