K-25 gaseous diffusion plant
... that the K-25 gaseous diffusion plant was once the largest building under one roof in the world?
... that the <b id="mwdA"><a href="./K-25" id="mwdQ" rel="mw:WikiLink" title="K-25">K-25 gaseous diffusion plant</a></b> was once the largest building under one roof in the world?