The Drouin marriage records are for Quebec only and summarize the Catholic records of the province. They go to the beginning of the parishes as early as the 1620s or so. I would imagine not all the parishes are included but what is missing - I do not know. Type in Drouin marriages in your keyword space for more information. I think the PRDH is more complete. You can get an inexpensive membership to the PRDH - again use your browser for more information. The difference between the 2 is Drouin has records up to the 20th c. and the PRDH is only thru 1799. Good luck searching! Terry