Aerospace Engineer -- Agricultural and Food Scientist -- Agricultural Engineer -- Astronomer -- Biological Scientist -- Biomedical Engineer -- Chemical Engineer -- Chemist -- Civil Engineer -- Computer Engineer -- Electrical & Electronics Engineer -- Geologist & Geophysicist -- Industrial Engineer -- Marine Engineer and Naval Architect -- Materials Engineer -- Mathematician -- Mechanical Engineer -- Medical Scientist -- Microbiologist -- Mining and Geological Engineer -- Nuclear Engineer -- Petroleum Engineer -- Physicist -- Veterinarian -- Zoologist -- Appendix A: Holland Code -- Appendix B: Bibliography.