The library probably won't be much use, they will just point you to the museum or the Berkshire Record Office.
The museum will look at them and say how interesting they are. They will not value them (for various reasons it is totally against museums' policy to provide valuations). They may be prepared to accept them into their collection (depends what they are) or they may suggest offering them to the Berkshire Record Office, they are unlikely to offer to pay for them unless there is something special about somewhere in West Berks.
The Record Office does buy particularly interesting documents - a lot depends on what you have got. If nothing else they are probably the best people to advise on the historical value (very different from any monetary value).
If you are trying to sell them you could always try ebay - but, as someone has already suggested, Drewatt Neate is a good starting point to see if they have any real value. However 1900-1935 is not very old, they will need to have something else going for them apart from age.
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