| P12686 | category for births in this time period | ... | Q6648032 (Category:1991 births) | Category:1991 births |
| P12687 | category for deaths in this time period | ... | Q6553799 (Category:1991 deaths) | Category:1991 deaths |
| P373 | Commons category | String | 1991 | ??? |
| P935 | Commons gallery | String | 1991 | ??? |
| P1889 | different from | ... | Q13143076 (1991) | 1991 |
| P156 | followed by | ... | Q2060 (1992) | 1992 |
| P155 | follows | ... | Q2064 (1990) | 1990 |
| P2354 | has list | ... | Q889761 (list of state leaders in 1991) | list of state leaders in 1991 |
| P527 | has part(s) | ... | Q2858048 (August 1991) | August 1991 |
| P527 | has part(s) | ... | Q2874566 (April 1991) | April 1991 |
| P527 | has part(s) | ... | Q3042494 (December 1991) | December 1991 |
| P527 | has part(s) | ... | Q2034005 (January 1991) | January 1991 |
| P527 | has part(s) | ... | Q3188197 (July 1991) | July 1991 |
| P527 | has part(s) | ... | Q3188261 (June 1991) | June 1991 |
| P527 | has part(s) | ... | Q3277976 (May 1991) | May 1991 |
| P527 | has part(s) | ... | Q3294925 (March 1991) | March 1991 |
| P527 | has part(s) | ... | Q3345439 (November 1991) | November 1991 |
| P527 | has part(s) | ... | Q3348940 (October 1991) | October 1991 |
| P527 | has part(s) | ... | Q3478981 (September 1991) | September 1991 |
| P527 | has part(s) | ... | Q12580176 (February 1991) | February 1991 |
| P31 | instance of | ... | Q235684 (common year starting and ending on Tuesday) | common year starting and ending on Tuesday |
| P31 | instance of | ... | Q3186692 (calendar year) | calendar year |
| P5461 | model year code | String | M | ??? |
| P2716 | montage image | CommonsMedia | http://commons.wikimedia.org/wiki/Special:FilePath/1991%20Events%20Collage%203.0.jpg | ??? |
| P361 | part of | ... | Q12138 (Gregorian calendar) | Gregorian calendar |
| P361 | part of | ... | Q34653 (1990s) | 1990s |
| P2959 | permanent duplicated item | ... | Q31803035 (???) | ??? |
| P585 | point in time | ... | 1991-01-01 | ??? |
| P7084 | related category | ... | Q9409279 (Category:1991-related lists) | Category:1991-related lists |
| P460 | said to be the same as | ... | Q109526461 (11991 HE) | 11991 HE |
| P460 | said to be the same as | ... | Q109530772 (1991) | 1991 |
| P910 | topic's main category | ... | Q6938714 (Category:1991) | Category:1991 |
| P9629 | Armeniapedia ID | 5414 |
| P12288 | Cathopedia article ID | 1991 |
| P11194 | Famous Birthdays ID | year/1991 |
| P6262 | Fandom article ID | years:1991 |
| P12653 | FürthWiki article ID | 2506 |
| P2671 | Google Knowledge Graph ID | /g/11b77d6b67 |
| P11924 | IMDb keyword | year-1991 |
| P13425 | KnowWhereGraph entity ID | instant.1991 |
| P244 | Library of Congress authority ID | sh92004649 |
| P8885 | Namuwiki ID | 1991년 |
| P8189 | National Library of Israel J9U ID | 987007532194605171 |
| P691 | NL CR AUT ID | ch969050 |
| P13600 | OberpfalzWiki article ID | 1991 |
| P6228 | OesterreichWiki ID | 14497 |
| P10291 | Wikisimpsons article ID | 36042 |
| P13591 | Yale LUX ID | concept/b09a1655-6cfc-43bd-a169-ea0c286c2389 |
| P8309 | Yle topic ID | 18-220168 |
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