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[xoxoxoBruce]

Originally Posted by ZenGum

Now plural possessives are another thing. There is a sign "Reader's Room" which should be "Readers' Room". A minute error .. but the sign is in the National Library of Australia!

How would one differentiate between a room for a reader, and a room for multiple readers?

[Urbane Guerrilla]

Originally Posted by xoxoxoBruce

How would one differentiate between a room for a reader, and a room for multiple readers?

Just as above. As written, it's a room for just one. Must be small. Move the apostrophe to after the S and now you've got them all covered.