Mr. James Paris Lee was well known for designing the Lee-Enfield, a rifle bolt system. It was used from 1895 until 1957 by the British Emmpire and Commonwealth military forces. It was around until the early to mid 1960's too.
Many books have been written on the Lee-Enfield. Good luck.
The Lee Enfield is a Controlled Round Feed rifle. The Lee Enfield Rifles (SMLE and other later versions for example the NO4 Mk1 and 2) are all Controlled Round Feed. The Lee Enfield bolt controls the round as soon as it comes out of the magazine. This prevents double feeding etc. Controlled Round Feed does not require a long non-rotating extractor, however that's the feature of the best known ones like the Mauser and its derivatives.
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Entire books have been written on Lee Enfield Rifles. You'll have to narrow it down a little. A Wikipedia search for SMLE will help you get started.
A Lee Enfield rifle typically weighed around 8.8 pounds (4 kilograms) without any additional attachments or modifications.
See the link below to a good Wikipedia article on the Lee Enfield. There are several DIFFERENT .303 Enfield rifles.
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1917 lee enfield
SMLE- aka the Lee Enfield
The 'E.Y'. rifle was named after Sir Ernest Youlle who invented it, or more accurately, adapted it from the standard Lee-Enfield rifle
See the link below for a short treatise (with photos) on the various Lee Enfield oilers.
ww1 Britain standard issue was a Lee Enfield and German was a Gewehr 98 WW2 Britain standard issue was a new version of the Lee Enfield and German was a Karabiner 98K