① memo 20180918 ~ Pearly Mussel Shell ~ Pearly interior of freshwater mussel shell , last sunday , on the quay of a polder waterway near Alphen in the Green Heart of Holland .
Pearly Mussel Shell
① memo 20180918 ~ Pearly Mussel Shell ~ Pearly interior of freshwater mussel shell , last sunday , on the quay of a polder waterway near Alphen in the Green Heart of Holland .