The physical posting of the notice must be in conspicuous places in and about the plants and offices of contractors and subcontracts, in the languages employees speak, so that the notice is prominent and readily seen by employees who are covered by the National Labor Relations Act and engage in the activities related to the performance of the contract. Contractor's who use a website to communicate with employees are also encouraged (perhaps required, depending on how you interpret the regulations) to post notices there as well.
Posters may be downloaded from the Department of Labor's website. They are available in English, Spanish, Mandarin, Hmong, Laotian, and Vietnamese. Contractors are not required to use the DOL posters. They can create their own if they choose.