O colecție interesantă de hărți diverse, accesibile gratuit si georeferentiate, inclusiv pentru spațiul românesc:
https://www.davidrumsey.com/
De exemplu, printre primele harti in care apar granitele judetelor pentru Valahia:
Franz Anton Schraembl, 1790 / Generalkarten von Ungarn Siebenbürgen, Sclavonien &&
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~303936~90074389:72G--Generalkarten-von-Urgarn-Siebe?sort=Pub_List_No_InitialSort%2CPub_List_No_InitialSort%2CPub_Date%2CPub_List_No_InitialSort%2CPub_Date&qvq=w4s:/when%2F1790;q:romania;sort:Pub_List_No_InitialSort%2CPub_List_No_InitialSort%2CPub_Date%2CPub_List_No_InitialSort%2CPub_Date;lc:RUMSEY~8~1&mi=6&trs=8
J. J. Hellert, 1843 / Carte generale de la Valachie, de la Bulgarie et de la Roumilie
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~317991~90086859:Planche-II--Carte-generale-de-la-Va?sort=Pub_List_No_InitialSort%2CPub_List_No_InitialSort%2CPub_Date%2CPub_List_No_InitialSort%2CPub_Date&qvq=q:valachie;sort:Pub_List_No_InitialSort%2CPub_List_No_InitialSort%2CPub_Date%2CPub_List_No_InitialSort%2CPub_Date;lc:RUMSEY~8~1&mi=0&trs=4