At Kaempfer's death his mostly unpublished manuscripts were purchased by Sir Hans Sloane via George I's court physician Johann Georg Steigerthal and conveyed to England.
Among them was a History of Japan, translated from the manuscript into English by Sloane's librarian John Gaspar Scheuchzer (1702–1729).
It was first published at London, in 2 vols.,
in 1727.
The original German (Heutiges Japan, Japan of Today) had not been published; the extant German version was translated from the English.
Besides Japanese history, this book contains a description of the political, social and physical state of the country in the 17th century.
For upwards of a hundred years, when Japan was closed to foreigners, it was the chief source of information for the general reader.
In the 21st century it is considered to have some value.
A life of the author is prefixed to the History.
Kaempfer's original manuscripts are held by the British Library.

Most have been published since 2001:
Engelbert Kaempfer, Werke.
Kritische Ausgabe in Einzelbänden.
Herausgegeben von Detlef Haberland, Wolfgang Michel, Elisabeth Gössmann.

Vol 1/1 Engelbert Kaempfer: Heutiges Japan.
Herausgegeben von Wolfgang Michel und Barend J. Terwiel.
2001.[xiv, 779 pp.,
93 ills.
Transliteration of EKs manuscript, British Library London, Ms Sl 3060, reproduction of drawings, index]
Vol 1/2 Engelbert Kaempfer: Heutiges Japan.
Herausgegeben von Wolfgang Michel und Barend J. Terwiel.
2001 [vii, 828 pp.,
56 ills.] [
Extensive commentary by Michel on Kaempfer's manuscript and drawings, Japanese and Western coworkers, Kaempfer's research context, his Japanese collection etc.
including a bibliography] ISBN 3-89129-931-1
Vol 2 Briefe 1683–1715.- München: Iudicium Verl.,
2001.
ISBN 3-89129-932-X ["Letters 1683–1715"]
Vol 3 Zeichnungen japanischer Pflanzen. –
München: Iudicum Verl.,
2003.
ISBN 3-89129-933-8 ["Drawings of Japanese plants"]
Vol 4 Engelbert Kaempfer in Siam. –
München: Iudicum Verl.,
2003. –
ISBN 3-89129-934-6 ["Kaempfer in Siam"]
Vol 5 Notitiae Malabaricae. –
München: Iudicum Verl.,
2003.
ISBN 3-89129-935-4 ["Notes on Malabar": on the southern India region, known as South Kerala]
Vol 6 Russlandtagebuch 1683. –
München: Iudicum Verl.,
2003.
ISBN 3-89129-936-2 ["Russia diary 1683"]
At Kaempfer's death his mostly unpublished manuscripts were purchased by Sir Hans Sloane via George I's court physician Johann Georg Steigerthal and conveyed to England. Among them was a History of Japan, translated from the manuscript into English by Sloane's librarian John Gaspar Scheuchzer (1702–1729). It was first published at London, in 2 vols., in 1727. The original German (Heutiges Japan, Japan of Today) had not been published; the extant German version was translated from the English. Besides Japanese history, this book contains a description of the political, social and physical state of the country in the 17th century. For upwards of a hundred years, when Japan was closed to foreigners, it was the chief source of information for the general reader. In the 21st century it is considered to have some value. A life of the author is prefixed to the History. Kaempfer's original manuscripts are held by the British Library.
Most have been published since 2001:
Engelbert Kaempfer, Werke. Kritische Ausgabe in Einzelbänden. Herausgegeben von Detlef Haberland, Wolfgang Michel, Elisabeth Gössmann.
Vol 1/1 Engelbert Kaempfer: Heutiges Japan. Herausgegeben von Wolfgang Michel und Barend J. Terwiel. 2001.[xiv, 779 pp., 93 ills. Transliteration of EKs manuscript, British Library London, Ms Sl 3060, reproduction of drawings, index]
Vol 1/2 Engelbert Kaempfer: Heutiges Japan. Herausgegeben von Wolfgang Michel und Barend J. Terwiel. 2001 [vii, 828 pp., 56 ills.] [Extensive commentary by Michel on Kaempfer's manuscript and drawings, Japanese and Western coworkers, Kaempfer's research context, his Japanese collection etc. including a bibliography] ISBN 3-89129-931-1
Vol 2 Briefe 1683–1715.- München: Iudicium Verl., 2001. ISBN 3-89129-932-X ["Letters 1683–1715"]
Vol 3 Zeichnungen japanischer Pflanzen. – München: Iudicum Verl., 2003. ISBN 3-89129-933-8 ["Drawings of Japanese plants"]
Vol 4 Engelbert Kaempfer in Siam. – München: Iudicum Verl., 2003. – ISBN 3-89129-934-6 ["Kaempfer in Siam"]
Vol 5 Notitiae Malabaricae. – München: Iudicum Verl., 2003. ISBN 3-89129-935-4 ["Notes on Malabar": on the southern India region, known as South Kerala]
Vol 6 Russlandtagebuch 1683. – München: Iudicum Verl., 2003. ISBN 3-89129-936-2 ["Russia diary 1683"]
Engelbert Kaempfer