Season 4, Episode 23 I'll Be Waving as You Drive Away

First Aired: March 13, 1978

Conclusion. Mary learns to cope with blindness at an Iowa school; a railroad embargo threatens Walnut Grove's economy. Adam: Linwood Boomer. Nash: David Opatoshu. Jenny: Jennifer Factor. Alden: Dabbs Greer. Mrs. Simms: Charlotte Stewart.