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Recommendations for images:
- < 4.77 Mb
- < 12,500,000 pixels
- if JPG, then not progressive
- PNG preferred to GIF
Specify, within an SVG file, the use of fonts supported by the software at Commons, and particularly "Liberation Mono", "Liberation Sans" and "Liberation Serif". See 
Special upload pages
- A Special:Upload page which does not work well.
- Another Special:Upload page which is said to work better.
- Yet another Special:Upload page, which appears to be usable; with what results remains to be seen.
Uploading images derived from other Commons images
See this advice.
Droysens Historical Atlas
User:Maproom/maps lists some maps from Droysens Allgemeiner Historischer Handatlas, uploaded to Wikipedia Commons.