At a book sale two years ago I bought a book about Harvard, not for its obvious contents but because inside, on the top right of the first, blank, page,  its original owner -- how many hands it had gone through, akin to Helenus Scott's celebrated adventurous rupee, is unknown -- had carefully written his name: "Thomas A. Lehrer."

At the bottom of the previous, second, appearance of the Lobachevsky song at NER I placed  some tags that may interest one or two people.