File:19th century knowledge mechanisms homemade concrete block mold parts.jpg
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English: 19th century knowledge mechanisms homemade concrete block mold parts |
| Date | |
| Source | How to use cement for concrete construction for town and farm, including ... |
| Author | Henry Colin Campbell |
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 03:55, 8 December 2009 | | 551 × 490 (43 KB) | Jonp154 (talk | contribs) | {{Information |Description={{en|1=19th century knowledge mechanisms homemade concrete block mold parts}} |Source=How to use cement for concrete construction for town and farm, including ... |Author=Henry Colin Campbell |Date=1920 |Permission= |other_versi |
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