The monoliths left by the Hylian people are inscribed with ancient script. If you find an inscription you cannot read, use this book and its meaning will become clear.
mudora is a minimal ALttPR ROM inspection tool. It shows the item locations for a given ROM and can perform item searches if you're stuck.
Warning
Using this tool to cheat on races makes Link sad. 
Run in CLI mode:
go run mudora <rom.sfc> [item-query]
go run mudora --versionTy Porter