We acknowledge Mr Ko Tim-keung for his contributions to this collection.

Ko Tim-keung is a Hong Kong history and historical photo researcher. He is the author and co-author of several books on Hong Kong. The publications in Chinese include Hong Kong: Past and Present, Hong Kong During the Japanese Occupation, Heritages of Kowloon City District, A Sense of Place: Hong Kong West of Pottinger Street, The Path Of Hong Kong, etc. He has also published in English including Serving Hong Kong: The Hong Kong Volunteers and Sewerage and Flood Protection: Drainage Services 1841-2008.