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Over the next nine years , construction of the road would continue along with the signing of the North Cascades National Park bill by President Lyndon B. Johnson in 1968 .
 North Cascades National Park, Lyndon B. Johnson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 North Cascades National Park, Lyndon B. Johnson