Map Indexes?

[salientpoints]

Hi there,

I am looking for a source which may (if it exists) list all the relevant scales and map areas relating to trench maps issued by the War Office / Ordnance Survery?

Does anyone know of such a thing and if so where does this index exist? I see there is a list at TNA but without physically going there it proves problematic as you cannot download it.

East Africa WO 300

Italy WO 369

Gallipoli WO 301

Mesopotamia WO 302

Palestine WO 303

Salonika WO 298

Western Front WO 297

Particularly for

Heavy/Medium artillery 1:20,000

Trench 1:10,000

Thanks

Ryan