English: Images/pictures taken in Switzerland in 1991 and sorted by month they were taken.

• This is not the date of the upload (check the upload date) nor the date a photo was scanned (can be in exif).

Avoid adding images with unclear dates into month subcategories (sample). Place these into more general categories. Ideally the date is in {{information}} and camera exif data.

Note: Images illustrating events of 1991 should be added into Category:1991 events in Switzerland. Only if the pictures were taken in 1991, they should be added here as well.