This image previously appeared in Terry Bennett's "History of Photography in China: Western Photographers 1861–1879", published by Bernard Quaritch in 2010, with the caption:
Fig. 1.6. William P. Floyd. Panoramic View of Macau, c.1872–73. Six-plate albumen-print panorama, titled and numbered in the negatives. Author’s Collection.
See http://gwulo.com/node/35363 for more information.
It is reproduced here with the permission of the author and publisher.