4 public-domain matches

Blue Space

Cover of Urban Blue Spaces

Urban Blue Spaces

Unknown author

Cover of Star Trek Actor William Shatner Flew Into Space On Blue Origin

Star Trek Actor William Shatner Flew Into Space On Blue Origin

Miroslaw Magola

Cover of The Sign of Four

The Sign of Four

Arthur Conan Doyle

The Blue Fairy Book

The Blue Fairy Book

Unknown author