"Histoire de L'Eglise de Corée" (1874)
Geographie physique de la Corée Le royaume de Corée, au nord-est de l'Asie, se compose d'une presqu'île de forme oblongue, et d'un nombre d'îles très-considérables, surtout le long de la côte ouest. L'ensemble est compris entre 33°15’ et 42° 25’ de latitude nord ; 122° 15’ et 128°30’ de longitude est de Paris. ( 128°30’ E+ 2°20’(Eastern longitude of Paris) = 130°50’E （Greenwich Meridian))
Dallet explains about the map as follows. (Thanks to matsu for the information.)
Celle que nous donnons en tête de cet ouvrage a été dressée, pour le littoral, d’après les cartes du dépôt de la marine, et pour l’intérieur du pays, d’après une carte indigène assez récente, tranduite par Mgr Ridel, vicaire apostolique de Corée.This is very important for the Takeshima/Dokdo dispute since the islets "Liancourt Rocks" were re-found and already charted by the French whaling ship Liancourt in 1849. In other words, this map proves even french Navy was almost certainly recognized "Usando" was Jukdo, not Takeshima/Liancourt Rocks/Dokdo and excluded the islets from Korean territory.
(The coastal place of this map was made by the maps of Navy and inland was by the vicar apostolic Ridel's translation of relatively recent map by local. )
Below are the informations on the author Dallet and this book I found on the net.
Claude-Charles Dallet was born in Langres, France, 18 October 1829. He entered the Se'minaire des Missions E'trange`res in 1850, and was ordained 5 June 1852. Though he spent his missionary life mainly in Asia, including India, he had never been to Korea. This book is mainly based on the materials collected by Msgr. Daveluy who was executed in Seoul in 1866.
Charles Dallet wrote this book, as he very clearly spells out in his preface, on the basis of letters and other communications received in Paris between 1836 and 1863 from the missionaries in Korea. In what must have been an intricately planned operation, Korean Catholic fishermen took the mail out to sea and passed it to Chinese Catholic fishermen who took it to Shanghai, whence it was dispatched to Hong Kong, where the Societe' des Missions E'trange`res had an agent, who posted it to Paris. This route was apparently pioneered and developed by Kim Tayken, Korea's first Catholic priest, who studied and was ordained in China. From 1836 on, all French priests who entered Korea, or in 1866 those who fled it, did so by sea. The Korean authorities had long since established virtually impenetrable security at the northern frontier, at least in so far as Europeans were concerned. (Gari Ledyard , Wiki : Japanese )