Flowering Plants and Ferns of the Riviera and Neighbouring Mountains
Clarence Bicknell, 1885
https://books.google.co.uk/books/about/Flora_of_Bordighera_and_San_Remo.html?id=TkC9QAAACAAJ&redir_esc=y
The printed version of the book is available at AbeBooks for about £20 (print on demand). Copies of the first edition have occasionally been available in the past from specialised booksellers for about £350.
Flora of Bordighera and San Remo
Clarence Bicknell, 1896
https://www.google.co.uk/books/edition/Flora_of_Bordighera_and_San_Remo/oKM-AQAAMAAJ?hl=en&gbpv=1&dq=Fritz+Mader&printsec=frontcover
The printed version of the book is available at AbeBooks for about £20 (print on demand) or for £250 (first edition)
A Guide to the Prehistoric Rock Engravings in the Italian Maritime Alps
Clarence Bicknell, 1913
https://archive.org/details/GE0036GenB212
The printed version of the book is available at AbeBooks for about £20 (print on demand), or for £250 (first edition). The reprint published by Cambridge University Press in 2016 is available on Amazon at £17.
With thanks to Graham Avery for the information.