# Tunnel in the Sky

> novel by Robert A. Heinlein

**Wikidata**: [Q4460565](https://www.wikidata.org/wiki/Q4460565)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tunnel_in_the_Sky)  
**Source**: https://4ort.xyz/entity/tunnel-in-the-sky


## References

1. Internet Speculative Fiction Database