Vintage public domain illustration available from the library of congress. I have spent some time giving some of the images a good clean up so that they are ready to use.
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License: CC0 Public Domain
Dawn Hudson has released this “The Aquarium” image under Public Domain license. It means that you can use and modify it for your personal and commercial projects. If you intend to use an image you find here for commercial use, please be aware that some photos do require a model or a property release. Pictures featuring products should be used with care.