From the first dilibri.de link you referenced, I would agree that it's
81 sheets (Bl.= Blätter), plus the reference map on the inside cover.

Anmerkung- Hier: 19 Bl. aus dem Rheingebiet, nebst Übersichtskt.;
Regionalatlas des Rheingebietes
Note- Here: 19 pages from the Rhein area, together with a overview
map; Regional atlas of the Rhein area

I counted from the PDF 21 maps in total. One of these is a key map.

I hope this information helps.

-- 
Joshua Davidowitz

On Fri, Jul 14, 2017 at 5:41 PM, Joel Kovarsky <[log in to unmask]> wrote:
> Looks to be around 81 sheets, but my German is not so good:
> https://www.zvab.com/servlet/SearchResults?an=JAEGER&tn=Carte+Topographique+d%27Allemagne&cm_sp=mbc-_-SRP-_-all
> . Also see: http://www.dilibri.de/rlb/content/titleinfo/1763671 and
> http://www.dilibri.de/rlb/content/titleinfo/1786523 .
>
>       Joel Kovarsky
>
>
> On 7/13/17 3:00 PM, Map & Data Centre Reference wrote:
>
> Our special collections library assistant came across a set of 20 maps
> titled Carte Topographique d’Allemagne by Jaeger dated 1789.
>
> I found this reference to them http://www.oldmapsonline.org/map/cuni/856224
> but it does not tell us how many maps are in this set.
>
> Does anyone have more details for us to go by?
>
>
>
> Cheryl Woods
>
> Map Librarian
>
> Western University
>
> London, Canada
>
>