I would like to find information about the history of Esplanadi (Helsinki)

There seems to be only one book in English about Esplanadi: "The Esplanade during the 19th century--Helsinki" by Henrik Lilius, 1984 (ISBN 87-85176-20-6). This work is primarily a pictorial production. It has color reproductions of original tinted project plans and black & white reproductions of original monocrome project plans. The photographs show what form the Esplanade did in fact take during the 19th century. The following address http://www.hel.fi/tourism/html/english/artikkelit/artikkelit/esplanadi… has an article about Esplanadi as well.