28 results found recently at OhioLINK. Among the sinners, you'll find high school pricipals, pricipal investigators, a co-pricipal, pricipal author, pricipal performer, pricipal works, and so forth. You might have expected to find this typo pricipally in notes. Pricipalment occurs in a Catalan-language record, as well as typos in other languages. Errors in materials other than English are out of scope for this project, as a matter of-- policy!
This post is princpnally thanks to Sue Weiland of Ball State University, who on Monday questioned on OCLC-Cat why WorldCat's spell checker did not catch such a typo.