Digital Library Search
![Casting the lead - Hydro Manual 1931 theb2131.jpg Casting the lead - Hydro Manual 1931](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb2131.jpg?itok=AGtEMQV4)
Description
Casting the lead - Hydro Manual 1931
Collection
Historic Coast & Geodetic Survey
Nautical Charting
Soundings
Casts of the Lead
Keywords
Charting
Soundings
Leadline
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.