Per the title, what are some of the oldest books on algebraic curves out there with unsolved exercises? Maybe there are some hidden gems from before the 20th century out there.



Reference request: Oldest books on algebraic curves with unsolved exercises?
Zeuthen’s *Lehrbuch der abzählenden Methoden der Geometrie* ([1914](//zbmath.org/?q=an:45.0799.01)) has *Übungsaufgaben* at the end of most sections (§§35, 48, 54, 59, 92, 97, 115, 141, 157, 166, 178, 185, 205).


Magnus’ *Sammlung von Aufgaben und Lehrsätzen aus der analytischen Geometrie* ([1833, 1837](//gdz.sub.uni-goettingen.de/volumes/id/PPN585370141)) has chapters on *Linien höherer Grade* (Vol. 3, pp. 241–292) and *Flächen höherer Grade* (Vol. 4, pp. 377–425).


