Extension box #20A - Anchor stone: grounded in great creative tradition - Anker
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300 blocks with construction manual #22, section plans #22 and packing scheme.
To be used in connection with the following boxes:
6 + 6A + 8A + 10A + 12A + 14A + 16A + 18A OR 4 + 4A + 6A + 8A + 10A + 12A + 14A + 16A + 18A.