| Asian trees |
| M.I.T. grads |
| Some MIT grads |
| Chang's twin's |
| Trees of Burma |
| Machines: Abbr. |
| Engineers, abbr. |
| Some R.P.I. grads |
| Most M.I.T. grads |
| Many M.I.T. grads |
| Locomotives: Abbr. |
| M.I.T. grads: Abbr. |
| Wankel et al.: Abbr. |
| Certain drawings: Abbr. |
| Some MIT grads, briefly |
| Some specialize in elec. |
| Some M.I.T. grads: Abbr. |
| Many Caltech grads: Abbr. |
| Some Caltech alums: Abbr. |
| Some Caltech grads: Abbr. |
| Professional people: Abbr. |
| Lots of R.P.I. grads: Abbr. |
| Road designers, e.g.: Abbr. |