@article {423,
	title = {A survey of the littoral marine mollusks of the Caribbean coast of Costa Rica},
	journal = {The Veliger},
	volume = {11},
	year = {1968},
	pages = {4-23},
	author = {Houbrick, J.R.}
}
@article {424,
	title = {Zonation in marine gastropods of Costa Rica and species diversity},
	journal = {The Veliger},
	volume = {10},
	year = {1968},
	pages = {207-211},
	author = {Bakus, G.J.}
}
