The First Buckinghamshire Battalion 1914-1919

My mother in law gave me this book that was printed by Hazell, Watson & Viney Ltd, at their Aylesbury printworks. Her father was 2nd in command of the printworks fire brigade during WW2. The book is in good condition inside with only a paint mark on the front cover. All the maps are in excellent condition for their age. First printed in 1920, so does this mean this is the first edition? I can't find any other date inside. It gives an account of what the First Buckinghamshire Battalion went through during WW1.