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| 008 | 741004s1972 cou f000 0 eng d | ||
| 035 | ⊔ | ⊔ | ‡asdr-pst.a7400820 |
| 035 | ⊔ | ⊔ | ‡a(OCoLC)1030107 |
| 040 | ⊔ | ⊔ | ‡aNYG ‡cNYG ‡dOCL ‡dOCLCQ ‡dCUS |
| 050 | 1 | 4 | ‡aTK1 ‡b.I59 v.31 |
| 082 | 0 | 4 | ‡a621.38411 ‡bZ16, 74-5866 |
| 086 | 0 | ⊔ | ‡aC 1.60:31 |
| 100 | 1 | ⊔ | ‡aZacharisen, Donald H. |
| 245 | 1 | 0 | ‡aNumerical mapping of the continents for use in high-frequency skywave radio predictions / ‡cD.H. Zacharisen. |
| 260 | ⊔ | ⊔ | ‡aBoulder, Co. : ‡bInstitute for Telecommunication Sciences, ‡c1972. |
| 300 | ⊔ | ⊔ | ‡aiii, 16 p. : ‡bill. ; ‡c27 cm. |
| 490 | 0 | ⊔ | ‡aUnited States. Dept. of Commerce. Office of Telecommunications. Telecommunications Research and Engineering Report ; ‡v31 |
| 500 | ⊔ | ⊔ | ‡a"OT/TRER 31" |
| 500 | ⊔ | ⊔ | ‡a"May 1972" |
| 500 | ⊔ | ⊔ | ‡aAt head of title: U.S. Dept. of Commerce. Office of Telecommunications. Institute for Telecommunication Sciences. |
| 504 | ⊔ | ⊔ | ‡aIncludes bibliography. |
| 538 | ⊔ | ⊔ | ‡aMode of access: Internet. |
| 650 | ⊔ | 0 | ‡aShortwave radio. |
| 650 | ⊔ | 0 | ‡aIonospheric radio wave propagation ‡vCharts, diagrams, etc. |
| 710 | 2 | ⊔ | ‡aInstitute for Telecommunication Sciences. |
| CID | ⊔ | ⊔ | ‡a100120245 |
| DAT | 0 | ⊔ | ‡a20110929110209.0 ‡b20131130000000.0 |
| DAT | 1 | ⊔ | ‡a20140129090552.0 ‡b2024-03-16T18:01:06Z |
| CAT | ⊔ | ⊔ | ‡aSDR-PST ‡dUNKNOWN ‡lloader.pl-003-009 |
| FMT | ⊔ | ⊔ | ‡aBK |
| HOL | ⊔ | ⊔ | ‡0sdr-pst.a7400820 ‡apst ‡bSDR ‡cPST ‡ppst.000070963717 ‡sPST ‡z1.60:31 ‡1a7400820 |
| 974 | ⊔ | ⊔ | ‡bPST ‡cPST ‡d20240316 ‡sgoogle ‡upst.000070963717 ‡z1.60:31 ‡y1972 ‡rpd ‡qbib ‡tUS fed doc |