Even when books are cataloged, they can still be missed. Renaissance dance manuals are rare, they talk about etiquette, and etiquette books are much more common. There&#x27;s been at least one dance manual that was never examined by a dance historian until a researcher with a hunch looked at all of the books classified as etiquette books.<p>In another case a dance manuscript written around 1500 AD sat in a pile of papers on a guy&#x27;s desk for a decade because it looked like it was a music manuscript -- much more common, no hurry to catalog another one.