After rising to No. 8 during holiday break, a split with RIT drops the Nittany Lions back to No. 9.
Birchmeier played in 26 games over the last two seasons.
Robinson is the fourth former Iowa State wideout to join Matt Campbell in Happy Valley.
Harvey has three years of eligibility remaining.
Sowell follows his older brother Chase in transferring to Penn State.
The freshman did not get any playing time this season.
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