British Guiana Map 1832

"A Sketch Map of British Guiana, South America, Compiled from the Surveys & Reports of Hancock, Hillhouse and Dutch & Spanish Authorities, with the probable boundaries Between the British, Columbians, Portuguese & Dutch, By Captain J.E. Alexander H.P. Late 16th Lancers" from The Journal of the Royal Geographical Society, Volume 2, 1832 to accompany "Notices of the Indians settled in the Interior of British Guiana. By William Hilhouse, Esq."
Source: The Journal of the Royal Geographical Society, Volume 2, 1832

British Guiana Map 1896

"Boundary Lines of British Guiana" from the Scottish Geographical Magazine. Published by the Royal Scottish Geographical Society and edited by James Geikie and W.A. Taylor. Volume XII, 1896.
Source: Scottish Geographical Magazine