Apart from scores of articles and reviews, he published important critical editions of works by Xenophon and Plutarch and pioneering, descriptive catalogs of the medieval copies of ancient Greek texts preserved in the libraries of Spain and Denmark.

Graux’s survey of hundreds of ancient stichometric line-counts preserved in medieval manuscripts confirmed that the same standard line was in use from the fourth century BCE through the Christian authors of late antiquity.

These results launched the rigorous study of ancient stichometry during the golden age of papyrology and led to Ohly’s definitive monograph fifty years later.

[3] Stichometry now plays a small but useful role in the study of ancient Greek and Latin papyri, and especially of the scrolls evacuated in Herculaneum.

With funding from the French government, he made his first 'scientific mission' to Spain in 1875-6 to study and catalog the Greek manuscripts in the national collections.