fig 51A, photo,
fig 51B, drawing,
fig 51C, drawing,
fig 51D, drawing,
fig 51E, drawing,
fig 51F, drawing,
fig 51G, drawing,
fig 51H, drawing,
fig 51I, drawing,
fig 51J, drawing,
fig 51K, photo,
fig 51L, drawing,
fig 51M, drawing,
fig 51N, drawing,
fig 51O, model,
fig 51P, photo,