These beach guides are laminated between heavy-duty plastic s o you ca n actually take them out into the surf.
The Invertebrate guide has 8 sides and retails for $21:
https://www.orcanetwork.org/webshop/p/ez-guide-to-common-intertidal-invertebrates-of-the-salish-sea
The Seaweed guide has 6 sides and retails for $19:
https://www.orcanetwork.org/webshop/p/ez-guide-to-seaweeds-of-the-salish-sea
There are no other tools I know of that are as effective for field ID of these critters and plants.
Hammond is just north of Warrenton. We're a few blocks from the north (Museum) entrance to Fort Stevens State Park.
$15 or best offer for the pair, or $8 or best offer for either one.