Mark Scroggins reviews To Be Brave to Things: The Uncollected Poetry and Plays of Jack Spicer in an essay/review titled "A Brilliant Poetry Star Who Burned Out Too Quickly," on Hyperallergic here:
https://hyperallergic.com/706315/a-brilliant-poetry-star-who-burned-out-too-quickly/?fbclid=IwAR2W8snYaIWKSF8e7UMid0Z84XA2DBvIzP5UBCpML4q_7W7aSFacHxZZcEw