| Author | Title | Publication | Date | Pages | Comments |
| Watchorn, Hugh | Paraguay - Los falsos | Chile Filatelico | Jun 1964 | 101-102 | Counterfeit |
| tipo Catedral |
| Watchorn, Hugh | Paraguay | American Philatelist | Oct 1968 | 911 | Bogus Issue |
| Revolutionary Issues | [misleading] |
| Watchorn, Hugh | Paraguay | Latin American Post | Dec 1984 | 698-699 | Bogus Issues |
| Revolutionary Issues | (reprint) |
| Watchorn, Hugh | Paraguay's Church of | American Philatelist | Jul 1963 | 757 | Counterfeits |
| the Incarnation |
| Weisz, Pedro | Identificación de los | Revista de las | Oct 1962 | 99-102 | Plating of 1 Real |
| 100 campos del 1 | Sociedad Filatelica |
| Wells, J. Avery | Paraguay | Mekeel's | Mar 4, 1940 | 188 | Quantities issued |
| Westhofen, F. | Paraguay | Aug 1908 | 155 | Varieties |
| Whitfield King & | Paraguay | Gibbons Stamp | Apr 1932 | 148 | Quantities of |
| Co. | Monthly | stamps printed |
| Whitfield King & | Paraguay | Mekeel's | Jul 4, 1927 | 387 | Quantities issued |
| Co. |
| Whitfield King & | Paraguay | Mekeel's | Nov 1, 1926 | 606 | Date of issue |
| Co. |
| Whitfield King & | Paraguay | Mekeel's | Sep 27, 1926 | 497 | Variety |
| Co. |
| Whitfield King & | Paraguay | Mekeel's | Jul 21, 1930 | 478 | Special cancellation |
| Co. |
| Whitfield King & | Paraguay | Mekeel's | July 21, 1930 | 478 | Special Zepp cancel |
| Co. |
| Witt, C. | Paraguay | American Journal of | Sep 30, 1893 | 495 | Variety of 1886 |
| Philately | prov official |
| Wolff, Philip | Paraguay | Mekeel's | Aug 13, 1910 | 282-283 | Date of issue |
| Wulff, Max | Deutsche Luftpost | Illustriertes | Apr 1, 1934 | 102-105 | Condor |
| nach Südamerika | Briefmarken Journal |
| Wulff, Max | Deutsche Luftpost | Illustriertes | Apr 21, 1934 | 115-116 | Condor |
| nach Südamerika | Briefmarken Journal |
| Zerbian, Dave | Paraguay overprint | Linn's | Jan 18, 1993 | 46 | Cancellation of |
| [letter] | Cosme |
| Ziegler or | In the Airship "Graf | L'Union Postale | Dec 1931 | 1-12 | Zepp |
| Reichspostministeriu | Zeppelin" to South |
| Zimmer, Dr. | Unbekanntes aus | Die Ganzsache | 1982 | 104-107 | Postcard & cancel |
| Sudamerika |
| Saturday, February 19, 2000 | Page 42 of 42 |