Amazon.com: Element14 Raspberry Pi 3 B+ Motherboard : Electronics
Raspberry Pi 3 B+ Pinout with GPIO functions, Schematic and Specs in detail
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Getting Started with Raspberry Pi and Installing Raspberry Pi OS | by Maria Elijah | Geek Culture | Medium
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Amazon.com: Ethernet/USB HUB HAT Expansion Board for Raspberry Pi 4B/3B+/3B/2B/Zero/Pi Zero W/Pi Zero 2W,with RJ45 10/100M Ethernet Port (Based on RTL8152B Chip) and Three USB Ports,Compatible with USB2.0/1.1 : Electronics
pi 3b+ - How to Define USB Port as a Stable Name on Raspberry PI 3B+ - Raspberry Pi Stack Exchange
Raspberry Pi Model B+ adds USB ports, expansion pins
Raspberry Pi 3 Model B+ - Pololu
Amazon.com: Bicool USB 3.2 Gen1 HUB HAT for Raspberry Pi 4B/3B+/3B/2B/B+/Zero/Zero W/Zero WH, 4X USB 3.2 Gen1 Ports, Compatible with USB 3.0/2.0/1.1 Driver-Free Plug&Play : Electronics
Benchmarking the Raspberry Pi 3 A+ | by Gareth Halfacree | Medium