Muddy trench and barbed approaching 'K' on the Trench Diagram :

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Bibliographic Details
Corporate Author: Adam Matthew Digital (Firm) (digitiser.)
Format: Electronic
Language:English
Published: Marlborough, Wiltshire : Adam Matthew Digital, 2011.
Online Access:Click for online access
Description
Item Description:AMDigital Reference: SAN_5046-5050.
Trench system.
Physical Description:1 online resource
Source of Description, Etc. Note:Online resource (viewed on October 15, 2018).
Location of Originals/Duplicates Note:Sanctuary Wood Museum