This website of amendments and additions to the nine volume series is searchable. Aircraft serial number is invaluable. The page identification convention is yyyy/ppp eg 1944/001: for Vol 1 1939-40 the year is 3940, Vol 7 is OCU, Vol 8 is HCU, Vol 9 is ROH.
Search tips are on the results page. For example adding an asterisk to a 'word' finds all instances including the 'word' e.g. NJG* finds NJG1, NJG2 etc. Searching for a unit e.g. 207 will find relevant pages on this website but may include other references such as page number 207 or an aircraft serial which includes 207.
The results text is set at the maximum length permitted by the search engine. Where a page contains many references to the item sought not all may be shown. That is why it is important to also search within all found pages.
Some pages are long: find something more quickly within a long page by clicking CTRL and F keys together.
A box should pop up. In that enter the word you are looking for eg 207
- the pop-up box may have next/previous buttons or up/down arrows to follow mentions up/down the page
- it may also say how many mentions there are on the page