# Conservation: the form or the substance: which?

> [Chicago]National Lumber Manufacturers Association[1919] | Library of Congress

**Wikidata**: [Q51458968](https://www.wikidata.org/wiki/Q51458968)  
**Source**: https://4ort.xyz/entity/conservation-the-form-or-the-substance-which-


## References

1. Biodiversity Heritage Library
2. Internet Archive
3. Library of Congress Online Catalog
4. Source