I don't use 11x14", but I do occasionally drag the 12x16" out to the car and take it for a ride...
An old 210mm f:6.8 Schneider Angulon just covers at very small stops; or at least it covers well enough for me. That is 500mm image circle, somewhat more than Schneider state for that lens. A 210mm Super Angulon has a nominal image circle of 500mm, yet it would be less usable on the 12x16" since it has a much sharper cutoff at the edge of coverage. it's easier to get away with a little blur than with a black corner.
John Z - back movements (other than rise/fall and shift) don't need more image circle. Front movements do, but you can often use a combination of front drop and tilt to get everything within the image circle - and emphasise the foreground at the same time. Then again my camera doesn't have front swing or tilt, only rise/fall and shift on the lens board. All tilt and swing is on the back, which makes it easier when the lenses just barely cover.
Underhill - I believe he must have used a Hypergon. Notice the evenness of illumination! It's either a Hypergon with propeller, or a Protar V with center filter. It was probably a "skyscraper" camera too.
A propos "skyscraper": Argentum Cameras make a similar one, for the same purpose. If I need really ridiculously wide I'll pop a 150mm WA Aplanat on my 9.5x12" tailboard camera - the camera can handle down to 50mm lenses with full movements, but I have nothing shorter than 150mm that covers the necessary 360mm image circle.