There are two desirable projector slides to own.

  • Slides
    • http://www.tess-elation.co.uk/m-c-escher---bibliography
    • http://scripts.iucr.org/cgi-bin/paper?S0021889869006509
    • https://aapt.scitation.org/doi/abs/10.1119/1.2351405?journalCode=pte

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