The target resource for this PURL can no longer be traced. The following is a list of the targets this PURL was previously assigned to.
| Timestamp | Target URL | Note |
|---|---|---|
| 10/14/10 22:28:07 | http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900014091_1990014091.pdf | |
| 02/04/19 14:55:30 | https://purl.fdlp.gov/history/GPO/LPS69222 | have requested a pdf copy from researchgate -- though copyright reasons were likely reason it was removed. |