| Title | Ehret Magnesia Manufacturing Company. Letter |
| Genre | Letters (correspondence) |
| Form | correspondence |
| Call Number | ave_biggert_00183 |
| Date | 1929 |
| DOI | 10.7916/D8WD5BH0 |
| Companies | Ehret Magnesia Manufacturing Company |
| Collector | Biggert, Robert |
| Current Location | Avery Architectural & Fine Arts Library, Columbia University |
| IIIF Manifest |  |
| Locations | Chicago, Illinois, United Statesadd_location |