The P1 is a wireless Module made by Particle in a LGA-75_28X20mm package with 75 pins. LGA-75_28X20mm New Arrivals ROHS.
JLCPCB lists it (part C18203125). 3 open-source boards in 3 repositories on GitHub use it.
The library has no symbol for this part yet.
The library has no footprint for this part yet.
LaMassa07/Arduino-nRF24-2.4GHz-Channel-Sweeper
Arduino project using an nRF24L01 to generate a constant carrier and perform a 2.4 GHz channel sweep for RF testing and experimentation purposes.
lamikr/hrm_breakoutboards
HRM related small pcb breakoutboards to help testing some components one by one.
OisinS13/FC_IP_rig
Code to control a FC rig based around a Powercell S2 24 cell PEMFC stack
LGA-75_28X20mm, with 75 pins.
Particle publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C18203125, with 0 in stock; the sellers' links on this page open their listings.
3 boards in 3 repositories on GitHub; the most starred are listed on this page, with their KiCad files.