Mally : Gegenstandstheoretische Grundlagen der Logik und Logistik (1912)

This work of Meinong disciple E. Mally (tr. Object theoretic foundations of logic and symbolic logic) can be found (in the original German) here:

https://mally.stanford.edu/mally.html

See also this interesting paper by E. Zalta about the relationship to Husserl's Ideen:

https://philpapers.org/rec/ZALMDA