The first thing you learn in buying used books is that other people's marginalia is ridiculous. Especially undergraduate marginalia.

A few cases-in-point, from my Oxford edition of the major works of Byron, which is mostly clean except for some very concentrated blue-pen marginalia around the "Ode to Napoleon Buonaparte":



[apparently, it's "about great disillusionment" and Elba was a "Mediterranian (sic) Alcatraz"]

( They just get better behind the cut. )