Air cleaning studies :
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- OCLC Number: 912555880
- Subject: Gases Cleaning Periodicals.
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- Publication history:
Print Holdings
| Archiving Institution | Program | Holdings Description | Retention |
|---|---|---|---|
| HathiTrust (HATHI) | HTDL | June 1951 (r=1581); December 1952 (r=1586); July 1953/June 1954 (r=4608); August 1954 (r=1591); July 1954/June 1955 (r=4611) | permanent |