| Author's List |
| title | creator | language | description | tableOfContents | contributor | subject | created |
| Preliminary Specifications: Programmed Data Processor Model Three (PDP-3) October, 1960 | Digital Equipment Corporation | en | PDP-3 (Computer); Electronic digital computers | 2009-07-20 | |||
| The New York Subway Its Construction and Equipment | Anonymous | en | 2006-01-21 | ||||
| A Catalogue of Play Equipment | Hunt, Jean Lee | en | 2009-04-01 |