Berchtold, L. v., & Heath. (1789). AN ESSAY to direct and extend the Inquiries of PATRIOTIC TRAVELLERS: With further Observations on the Means of preserving the Life, Health, & Property of the inexperienced in their Journies by Land and Sea. ALSO a Series of Questions, interesting to Society & Humanity, necessary to be proposed for Solution to Men of all Ranks & Employments, & of all Nations and Governments, comprising the most serious Points realtive to the Objects of all Travels. To which is Annexed a List of English and foreign Works, intended for the Instruction and Benefit of Travellers & a Catalogue of the most interesting European Travels, which have been publish'd in different Languages from the earliest Times, down to September 8th. 1787. Vol. 1. LONDON: Printed for the Author.

Berchtold, Leopold von, and Heath. AN ESSAY to Direct and Extend the Inquiries of PATRIOTIC TRAVELLERS: With Further Observations On the Means of Preserving the Life, Health, & Property of the Inexperienced in Their Journies By Land and Sea. ALSO a Series of Questions, Interesting to Society & Humanity, Necessary to Be Proposed for Solution to Men of All Ranks & Employments, & of All Nations and Governments, Comprising the Most Serious Points Realtive to the Objects of All Travels. To Which Is Annexed a List of English and Foreign Works, Intended for the Instruction and Benefit of Travellers & a Catalogue of the Most Interesting European Travels, Which Have Been Publish'd in Different Languages From the Earliest Times, Down to September 8th. 1787. Vol. 1. LONDON: Printed for the Author, 1789.

Berchtold, Leopold von, and Heath. AN ESSAY to Direct and Extend the Inquiries of PATRIOTIC TRAVELLERS: With Further Observations On the Means of Preserving the Life, Health, & Property of the Inexperienced in Their Journies By Land and Sea. ALSO a Series of Questions, Interesting to Society & Humanity, Necessary to Be Proposed for Solution to Men of All Ranks & Employments, & of All Nations and Governments, Comprising the Most Serious Points Realtive to the Objects of All Travels. To Which Is Annexed a List of English and Foreign Works, Intended for the Instruction and Benefit of Travellers & a Catalogue of the Most Interesting European Travels, Which Have Been Publish'd in Different Languages From the Earliest Times, Down to September 8th. 1787. Vol. 1. LONDON: Printed for the Author, 1789.