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| Park Name | Notes | Stamp(s) |
Ebey's LandingNational Historic Reserve |
An urban island. | 
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Fort VancouverNational Historic Site |
A trading post on the Columbia. |  
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Lake ChelanNational Recreation Area |
A remote area of the lake. |   
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Lake RooseveltNational Recreation Area |
Including the Grand Coulee Dam. | 
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Mount RainierNational Park |
An impressive mountain. |    
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North CascadesNational Park |
Mountain range. |      
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OlympicNational Park |
Rain forest, tidal pools, mountains. |  
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Ross LakeNational Recreation Area |
Inside North Cascades NP. |    
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San Juan IslandNational Historical Park |
British and American camps. | 
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Whitman MissionNational Historic Site |
A stop on the Oregon Trail. | 
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