If you use the link http://www.umoncton.ca/ it gets you to the main university site (apologies my French is atrocious). Once at the main site you should be able to negotiate your way to the archives you're looking for.
If you put 1755 census into the search box it returns these results
http://www.umoncton.ca/google/?cx=015502390780218832549%3Au-li9q5eugg&cof=FORID%3A11&q=1755+census&q2=1755+census&op.x=-924&op.y=-32&form_id=google_cse_results_searchbox_form
Hope this helps
