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“The timing of linguistic milestones in sign language acquisition: Are first signs acquired earlier than first words?”

“The timing of linguistic milestones in sign language acquisition: Are first signs acquired earlier than first words?” Petitto, L. A., & Marentette, P. (1990, October)
“The timing of linguistic milestones in sign language acquisition: Are first signs acquired earlier than first words?” Presented at The 15th Annual BostonUniversity Conference on Language Development conference, Boston, MA.

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