While there is no Parallèle curieux at GoogleBooks, WITH HELP (see comment below), I was able to find these volumes of Lebeau's works available at Google Books! In what free time I can find, I will be transcribing materials from these books here: Google Books - Leabeau.
- Carmina, 1782: Google Books Link
- Fabulae, Narrationes, et Aliae Amplificationes, 1782: Google Books Link
- Orationes et Oratiunculae (also including a Supplementum with additions to the first and second volumes), 1783: Google Books Link
- Novum Supplementum, sive Carmina, Fabulae, Amplificationes, etc. (items lacking in the previous volumes), 1816: Google Books Link